4-sl fluorescent tube



FIG. 1 is a front view of a 4-SL fluorescent tube showing my new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a 4-SL fluorescent tube, as shown and described. 